From nobody Thu Nov 6 19:51:27 2025 Delivered-To: importer@patchew.org Received-SPF: temperror (zoho.com: Error in retrieving data from DNS) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=temperror (zoho.com: Error in retrieving data from DNS) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1542883197029838.3347278451097; Thu, 22 Nov 2018 02:39:57 -0800 (PST) Received: from localhost ([::1]:45073 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gPmOc-0005Yi-EY for importer@patchew.org; Thu, 22 Nov 2018 05:39:42 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:42640) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gPmMB-00038i-Jg for qemu-devel@nongnu.org; Thu, 22 Nov 2018 05:37:12 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gPmM9-0004Nn-01 for qemu-devel@nongnu.org; Thu, 22 Nov 2018 05:37:11 -0500 Received: from mx1.redhat.com ([209.132.183.28]:51510) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gPmM8-0004MD-Qj for qemu-devel@nongnu.org; Thu, 22 Nov 2018 05:37:08 -0500 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 28E8899C1C; Thu, 22 Nov 2018 10:37:08 +0000 (UTC) Received: from dell-r430-03.lab.eng.brq.redhat.com (dell-r430-03.lab.eng.brq.redhat.com [10.37.153.18]) by smtp.corp.redhat.com (Postfix) with ESMTP id EC8F519C7E; Thu, 22 Nov 2018 10:37:06 +0000 (UTC) From: Igor Mammedov To: qemu-devel@nongnu.org Date: Thu, 22 Nov 2018 11:29:33 +0100 Message-Id: <1542882574-109418-2-git-send-email-imammedo@redhat.com> In-Reply-To: <1542882574-109418-1-git-send-email-imammedo@redhat.com> References: <1542882574-109418-1-git-send-email-imammedo@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Thu, 22 Nov 2018 10:37:08 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH 1/2] pc: acpi: use correct RSDT length for checksum X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, drjones@redhat.com, sameo@linux.intel.com, mst@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" AcpiRsdpDescriptor describes revision 2 RSDP table so using sizeof(*rsdp) for checksum calculation isn't correct since we are adding extra 16 bytes. But acpi_data_push() zeroes out table, so just by luck we are summing up exta zeros which still yelds correct checksum. Fix it up by explicitly stating table size instead of using pointer arithmetics on stucture. PS: Extra 16 bytes are still wasted, but droping them will break migration for machines older than 2.3 due to size mismatch, for 2.3 and older it's not an issue since they are using resizable memory regions (a1666142d) for ACPI blobs. So keep wasting memory to avoid breaking old machines. Fixes: 72c194f7e (i386: ACPI table generation code from seabios) Signed-off-by: Igor Mammedov --- there is no changes to the current RSDP content caused by this patch --- hw/i386/acpi-build.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c index 236a20e..131c565 100644 --- a/hw/i386/acpi-build.c +++ b/hw/i386/acpi-build.c @@ -2567,7 +2567,7 @@ build_rsdp(GArray *rsdp_table, BIOSLinker *linker, un= signed rsdt_tbl_offset) =20 /* Checksum to be filled by Guest linker */ bios_linker_loader_add_checksum(linker, ACPI_BUILD_RSDP_FILE, - (char *)rsdp - rsdp_table->data, sizeof *rsdp, + (char *)rsdp - rsdp_table->data, 20 /* ACPI rev 1.0 RSDP size */, (char *)&rsdp->checksum - rsdp_table->data); =20 return rsdp_table; --=20 2.7.4